21380104 has 16 divisors (see below), whose sum is σ = 40176720. Its totient is φ = 10666320.

The previous prime is 21380081. The next prime is 21380113. The reversal of 21380104 is 40108312.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1207 + ... + 6649.

It is an arithmetic number, because the mean of its divisors is an integer number (2511045).

Almost surely, 2^21380104 is an apocalyptic number.

It is an amenable number.

21380104 is a deficient number, since it is larger than the sum of its proper divisors (18796616).

21380104 is a wasteful number, since it uses less digits than its factorization.

21380104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5940 (or 5936 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 21380104 is about 4623.8624547017. The cubic root of 21380104 is about 277.5470428593.

Adding to 21380104 its reverse (40108312), we get a palindrome (61488416).

The spelling of 21380104 in words is "twenty-one million, three hundred eighty thousand, one hundred four".